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one with mno 4- Rare earth europium coordination polymer with detection function and preparation method thereof
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A technology of coordination polymer and rare earth, applied in the field of chemistry, can solve the problem of less coordination polymer, and achieve the effects of high thermal stability temperature, high sensitivity and mild reaction conditions
Active Publication Date: 2021-06-29
NORTHWEST UNIV
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[0006] At present, researchers have prepared a large number of coordination polymers with luminescent properties by using various organic ligands to react with some rare earth metal ions, although some of them exhibited a strong response to chromate ions (CrO 4 2- ), dichromate ion (Cr 2 o 7 2- ), fluoride ion (F - ) and other anions such as luminescent detection performance, however, able to detect MnO 4 - Coordination polymers are rare
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[0050] Coordination polymer [Eu(L) provided by the invention 3 (H 2 O) 2 ] n The preparation method has the advantages of simple process, mild reaction conditions, cheap and easy-to-obtain raw materials, and the solvent used is water, which will not pollute the environment. The preparation method specifically includes the following steps:
[0051] Step1: Mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water at a molar ratio of 1:1:400-500, and stir evenly to obtain a mixed solution;
[0052] Step2: Seal the mixed solution in the reaction kettle, heat it to 140-160°C, and keep it for 60-96 hours;
[0053] Step3: Cool the reactor to room temperature at a cooling rate of 5-8°C / h to obtain colorless blocky crystals.
Embodiment 1
[0055] Step1: mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water in a molar ratio of 1:1:400, stir evenly to obtain a mixed solution;
[0056] Step2: Seal the mixture in the reaction kettle, heat it to 140°C, and keep it for 96 hours;
[0057] Step3: Cool the reactor to room temperature at a cooling rate of 5°C / h to obtain colorless blocky crystals.
[0058] After detection, the colorless blocky crystals are coordination polymers [Eu(L) 3 (H 2 O) 2 ] n .
[0059] After calculation, the coordination polymer [Eu(L) 3 (H 2 O) 2 ] n The yield was 63%.
Embodiment 2
[0061] Step1: mix europium nitrate hexahydrate, 3-methyl-4-cyanobenzoic acid and water at a molar ratio of 1:1:450, and stir evenly to obtain a mixed solution;
[0062] Step2: Seal the mixture in the reaction kettle, heat it to 150°C, and keep it for 80h;
[0063] Step3: Cool the reactor to room temperature at a cooling rate of 5°C / h to obtain colorless blocky crystals.
[0064] After detection, the colorless blocky crystals are coordination polymers [Eu(L) 3 (H 2 O) 2 ] n .
[0065] After calculation, the coordination polymer [Eu(L) 3 (H 2 O) 2 ] n The yield was 65%.
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Abstract
The invention discloses a 4 ‑ Rare earth europium coordination polymer with detection function and preparation method thereof, wherein, the chemical formula of the coordination polymer is [Eu(L) 3 (H 2 O) 2 ] n , where L is a ligand, specifically the negative monovalent anion of 3-methyl-4-cyanobenzoic acid, the coordination polymer belongs to the monoclinic crystal system, P2 1 / c space group, an asymmetric unit contains an independent Eu 3+ , three L ligands and two coordinated H 2 O, each Eu 3+ The center is coordinated with nine oxygen atoms, which are derived from the seven carboxylic acid groups and the two coordinated H in the six L ligands. 2 O, adjacent Eu 3+ It is bridged by L ligands to form a chain coordination polymer. The excitation wavelength is 394nm, and the emission wavelengths are 577nm, 591nm, 617nm, 652nm and 697nm, showing bright red light that can be observed by the naked eye. The present invention is beneficial in that: the coordination polymer provided by the present invention has MnO 4 ‑ With good selectivity, high sensitivity and low detection limit, it can detect MnO in aqueous phase simply, quickly and accurately 4 ‑ .
Description
technical field [0001] The invention relates to a coordination polymer and a preparation method thereof, in particular to a coordination polymer with MnO 4 - A rare earth europium coordination polymer with detection function and a preparation method thereof belong to the field of chemical technology. Background technique [0002] Potassium permanganate (KMnO 4 ), as an important oxidant in laboratory and industrial production, is widely used in the removal of pollutants such as As(Ⅲ) and harmful organic substances in sewage. When large-scale misuse and indiscriminate emission of KMnO 4 , the ambient water will contain too much permanganate ions (MnO 4 - ), which will not only cause respiratory infection and skin irritation, but also cause environmental pollution, causing serious safety hazards. [0003] Therefore, in the field of analytical technology and environmental science, the search for rapid and sensitive detection of MnO 4 - It is of great significance to imp...
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